Does anyone have recommendations for waterproof inks for fountain pens? Are there any that you love? I’m looking for some for my postcard writing! 
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In general: Almost every ink in “blue-black” (that’s an information I got from an employee at Faber-Castell).
It’s said that these inks are waterproof / indelible: Montblanc Midnight Blue, Pelikan Edelstein Tanzanite, Pelikan 4001 blue-black, Rohrer und Klingner Iron gallus ink “Salix”.
About 2 years ago I bought “Faber Castell high quality ink - royal blue” directly at the factory outlet. They told me that it is waterproof. I used it only one time then I broke the converter. So no further experience for postcards. When I look on the website it’s said “Most of our high quality inks are waterproof”, but unfortunately no further details…
My love instead belongs to ink of Diamine and Octopus fluids…these colors… 
But…meanwhile I found out that there is also waterproof ink for Lamy, too, and, surprise, I also have one of those - yeah. It’s the color blue-black, too.
(I also found inkpots at Lamy website, so I have to go now for shopping … sigh…)
Edit: I’ve just went to Wikipedia and found an article (unfortunately in German only). So I learned that the Montblanc Midnight blue is no longer with iron gallus. And: inks with iron gallus can cause ink corrosion on the paper - ooops 
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Yeah, I am into fountain pens, but somehow along the way, I can’t keep up on the rising prices of the great brands and inks. But I still love them.
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I’m using Sailor Seiboku, I love it! I’ve tried the Platinum ones - my favourite is Forest black. My only issue with the Platinum Iron Gall are they can be dry with “dry” nibs.
@adrimagination’s JetPens link is great. I’ve also read somewhere (maybe in an old Forum thread) that some people just use their favorite non-waterproof fountain pen ink and then rub over it with a stick of wax or paraffin. I tried it myself a few times and it seemed to work all right, but these days I use my fountain pens mostly for things other than postcard writing, and my stick of paraffin has disappeared somewhere.
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I’m a big fountain pen fan for me I got into fountain pens first, then onto Postcrossing (was looking for ways to use the pens - so writing postcards sounded good)
I do use my fountain pens on postcards - though they can take a while to dry. I usually use an ink that dries quicker, or a rocker blotter to blot away excess ink.
Waterproof inks - I like the Noodler’s series.
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Has anyone tried rubbing paraffin or wax on postcards when using non-iron gall/non-waterproof ink? I’ve been using regular inks lately but not sure if the recipients get my cards with the messages still readable!
Hi,
I also love fountain pens… I have several now but not using them all the time.
Do you have any advice on how to clean them before storing them?
Thanks!
I am a happy and devoted fountain pen user! I won’t say how many pens and inks I use, but the people who get my cards have a good idea. 
I generally use at least 3 different pens and inks on each card.
Water-resistant inks are problematic for a number of reasons, in my opinion, so I don’t generally use them. My solution to the problem of smudging and smearing is to cover my writing with clear packing tape. It’s a little more work, but I think it’s worth it.
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@HalloweenHJB Hi, and welcome to the new forum! 
That is a very impressive collection you have there.
If you have the time, please do share some of your tips and experience with the community! For instance, why do you say water-resistant inks are problematic? I’ve been considering them for a while since I’ve had one or two complaints of smudged postcards… but now I wonder if your solution would be better.
@meiadeleite I just got this Distress Glaze maybe you can find it locally? It’s like petroleum jelly to waterproof ink.
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Oh, this sounds like magic! Can you see it at all once you rub it in the paper?
Nope! It goes on clear but you can kind of tell there’s an oily film when you first apply it, the instructions say you have to wipe it though.
@meiadeleite I can tell you even though I don’t have a lot of experience: water-resistant inks can clog your pen, because most of them are pigment inks. It’s hard to clean a pen with pigment inks in comparison with water-based inks. You should buy a more cheaper pen for pigment inks with “a cartridge-converter system”, that’s just my opinion. Most of expensive pens are “piston-filler pens”, they are for water-based inks. You should write with pens with water-resistant inks every day, preferably. Pens with water-based inks can be stay with inks for months, and they will start to write immediately, pens with water-resistant inks - not, as I said before, they need to write more often.
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Thank you for the very thorough explanation! It seems like water-resistant inks can be a lot of work… 
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@meiadeleite I have Iron Gall (Platinum Forest Black) in one pen and Sailor Seiboku (pigmented) in one pen - both are my pricier pens…I’ve had them inked for a few weeks now, as long as proper pen maintenance is done (I flush them/make sure I keep the ink moving) - no problems so far.
If you are worried about pen issues the distress glaze works (I finally had time to write with regular ink and I’m happy with the results) 
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